Mold.



PATENTED NOV. 19, 1907.

J. B. BLAW.

MOLD.

APPLICATION FILED FEB. 16, 1907.

3 SHEETS-SHEET 1.

3SHEETS-SHEET 2.

PATENTED NOV. 19, 1907.

J. B. BLAW.

MOLD.

APPLICATION FILED FEB. 16, 190'].

PATENTED NOV. 19, 1907.

J. B. BLAW.

MOLD.

APPLIOATION FILED FEB. 16, 1907.

3 SHEETS-SHEET 8.

WITNESSES [mart an sra'rns OENTERING COMPANY, OF PITTSBURG, JERSEY.

To all whbm it may concern:

Be it known that I, JACOB B. BLAW, a citizen of the United States, residing at Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Molds, of which the following is a specification. a

My invention relates to molds and particularly to knock-down molds or sectional molds upon which to form the concrete walls of tunnel's, sewers and conduits. The invention has'for its objects to provide a mold of supe- -rior rigidity with a minimum amount of metal; to provide a mold which can be bu11t up in sections as the concrete is filled in; to

provide a ,inold in which the su porting frame work can be readily detached om the shell of the mold andsuch shell removed from the concrete in comparatively small sections ,5 and to provide an improved means for scour-- ing the plates which form the shell of the 'mold to the frame work. The invention is illustrated in the accompanying drawings in which Figure 1 is a transverse section through one form of; sewer molds,

Fi ure 2 is a longitudinal sectionon the line III of Figure -1;

Figure 3 is an enlarged sectional detail on the line III-III of Figure 1 showing the means of attaching the vertical edges of the plates-detachably to the circumferential ;T ribs constituting the frame of the devlce.

Figure 4 is a detail plan view of two of the plates detached from the supporting T rib and showing the vertical securing angles adj acent the vertical edges of the plate and the overlapping plate at the horizontal edges for securing atight joint at such edges,

Figure 5 is a transverse sectional view of a modified form of mold, and

Figure 6 is a transverse sectional View of still another form of mold.

The mold comprises a series of circumferential T ribs spaced apart longitudinally the length of the plates constituting the shell, and a shell composed of a series of lates resting at their ends upon the T ribs, w 'ch plates are detachably secured to the ribs so that after the concrete has set about the mold the ribs may be detached from the plates and reproved, after which the plates constituting Specification of Letters Patent.

Application filed February 16I 1907. Serial No. 357.628.

PATENT @FMQE.

.JAGOB B. BLAW, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR TO BLAW OOLLAPSIBLE STEEL PENNSYLVANIA, A CORPORATION OF NEW mom).

. Patented Nov. 19, 1907.

the shell can be gradually built up commenc- 1 ing at the bottom and filling in behind the .plates as they are placed in position.

Referring to Figures 1 and '2, 1 are the circumferential T ribs constituting the frame work of the mold and spaced a a'rt lon itudinally a distance equal to the ength o the sectional plates composing the shell of the mold, 2 are\the plates constituting the shell, which plates as shown are eight in number and are bent to the desired radius necessary to fit the curve of the T rib, 3 are angles se-' Figure 2, so that the upstanding legs of the angles will abut the flanges of the T rib,-4 are wedges which ass through the u standing legs of the ang es and press upon t e tops of the lateral flanges of the'T rib for locking the plate to the T rib, and 5 are the hinge lates, one on either side of the upstandin eg of the T rib whereb the two halves o the T ribs are movab y joined together. The means, just referred to, for detachably securing the vertical abuttin edges of the plates to the T rib detachabiy is shown in detail in Figure 3 which fi ure 1s a horizontal section on the line III- II of Fig. 1. As here shown it will be seen that the abutting edges of the plates 2 2 are located op osite the upstanding flange of the T rib 1 an that each of the lates 2 2 is provided with the angles 3, w 'ch are riveted rigidly to the plate at a distance from the edges thereof substantially equal to the len th of the,lat eral flange of the T rib 1. The upstanding portions of these angles 3 are as shown, pro vided with erforations to receive the wedges 4 so t at when such wed es 4 are driven through the erforations in t e legs of the angles they press tightly upon the laterally extending flangesof the T rib 1, thus securedly fastening the edges of the plate to such T ribs. In order that the horizontal edges 6 of the plates may be flush and members plate 7 shown in Figures 2 and 4 are provided, which overlapping members are riveted to one; sheet and adapted to extend down over'the ed e of the other plate. As heretofore indicated, the two halves of the ribs 1 are hinged togetherby means of the plates 5, and in-order that the smooth upon the outside, the overlapping cured adjacent each edge of the plate at such a distance from the edges as indicated in upper ends may move in, a space is provide etween the upper ends of the halves as shown in The operation is as follows. A layer of cement having been laid for the bottom of the "sewer, several of the T ribs with the bottom plates.

plates attached thereto, are placed in position, and the concrete filled in till it reaches the upper edges of such plates. Another pair of plates are now secured to the rib above the first pair by means of thewedges 4, and still more concrete is added and the sewer walls built up to the upperedges of the The remaining plates are then added successively in the same manner until all have been placed in position as shown in Figure 1 and the entire mold is surrounded with concrete. It will be understood that this operation may be carried on simultaneously with as many len ths of plates as can be conveniently handle which number will depend uporr the size of the plates and upon the size of the sewer or tunnel being constructed. After the cement has set about the plates, the Wedges 4 are removed freeing the ribs 1 from the plates 2 and such ribs are then contracted by means of the turnbuckles 7 and removed from the sewer, after which the plates 2 can be easily detached from the cement and removed to be'used in a new location. It will be apparent from the foregoing that the structure provides a very rigid mold with a minimum amount of .metal, and that the mold is convenient of o eration as the plates are easily secured to t e ribs and removed therefrom, and furthermore, the concrete or cement is easily applied because of the fact that such concrete 1S posltioned separately for each section and there are no interfering sections above to prevent a proper placing and packing of the concrete. It will also be apparent thatbecause of the small weight and size of the parts of the mold, it can'be easily handled and removed to different locations.

In Figure 5 a slightly diflerent form of mold is shown. In this form of mold, supporting corner struts 8 are used for stiifening the T rib, which construction is desirable when the mold is of large diameter, and furthermore secures a saving of metal as the increase stiflness due to the struts, permits of the use of a light T section. Otherwise this form of mold is the same as shown in Figures 1 to 4.

In Figure 6 the construction is shown as applied to the horse shoe shaped tunnel or sewer. -The top of the'mold is provided with the hinge 9 corresponding to the hinge 5 at the bottom of the mold of Figure 1, and the turn-buckle IOtakesthe place of the turn buckle 7 as used in the form of device of Figure 1. In constructing atunnel with this type of mold, the bottom is firstlaid to the dotted lines 12 shown in Figure 6, after which the timhere 11 and wedges 13 for supporting the mold, are positioned, and the T ribs secured together by means of the bottom plates and the walls built up in the manner described for the form of device a's'shown in Figures 1 to .4. As this form of device is largely used with very large passages, it may be found con-. venient to carry the material to the desired position by means ofcars running upon a track upon the bottom 12 of the sewer, which feature of construction, however, in nowise effects the invention involved and is referred to merely to indicate the rapidity with which a conduit may be constructed when this form of mold is used, it being apparent that such cars could not. be conveniently'used in the old form' of mold provided with the cross braces or ties. It will be apparent that various modificationsv of the exact structure shown might be made without departing from the spirit of the invention. The-T ribs shown are ordinary integral commercial sections,--but it will he understood thatbuilt up Ts of regular or irregular shape might be used, and in fact any style of supporting ribs might be substituted for those shown, it only being necessary that side flanges be provided for the engagement with the Wedges. These and other modifications which will be apparent to those skilled in the art are comprehended by my invention and intended to be covered by the claims.

Having thus described my invention and illustrated its use, what I claim as new and desire to secure by Letters Patent, is the following:

1. A mold comprising spaced supporting ribs having lateral flanges and a shell comprising .a plurality of plates abutting behind the ribs, together with wedging means for releasably securing the plates to the lateral flanges. I

2. A mold comprising spaced supporting ribs having lateral flanges and a shell comprising a plurality of plates abutting behind the ribs and provided with inturned flanges adjacent the ed es of the lateral flanges, together With we ging means for securing the intu-rned flanges to the lateral flanges.

3. A' nrold'comprising spaced supporting ribs having lateral flanges and a shell comprising a plurality of plates abutting behind the' ribs and provided withperforated inturned flanges adjacent the edge of the lateral flanges, together with wedges adapted .to pass through the perforations and engage the lateral flanges.

4. A mold comprising spaced supporting ribs having inwardly projecting flanges and a shell comprising a plurality of plates abuts 5 ting behind the ribs, together with clamping means adapted to move the edges of the plates in a direction radial of the mold and hold them against the ribs.

5. A mold comprising spaced circumferenpass through the said tial supporting ribs having lateral flanges, a shell consisting of plates abuttin along their verticaledges at the backs of the ribs, and havin members with projecting perforated legs a jacent the vertical ed es of the plates and removable holding mem ers adapted to erforations and engage the said lateral anges, whereby the plates are locked detachably to the ribs.

6. A mold comprising spaced supporting ribs each having side flanges and an inwardly extending flange, and a shell consisting of a the side flanges an t e plates and operable 15 from the interior of the mold for detachably clamping the plates to the ribs.

In testimony whereof, I hereunto sign my name in the presence of the two subscribed witnesses;

JACOB B. BLAW. Witnesses:

J. C. BRADLEY, F. E. GAITHER. 

